<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>列表移动</title><script type="text/javascript" src="/static/jquery-1.11.3.min.js"></script>
<script>
	$(function () {
		$('#btn').click(function () {
		    // $('option:eq(2)').prop('selected',true);
            $('#s1').val(3);
		})

    })
</script>
</head>
<body>
	<select id="s1">
		<option value="1">选项1</option>
		<option value="2">选项2</option>
		<option value="3">选项3</option>
		<option value="4">选项4</option>
		<option value="5">选项5</option>
	</select>
	<br/>
	<input id="btn" type="button" value="回显第3个选项" ;"/><br/>
</body>
</html>